Timing apparatus for fuel injection pump



TIMING APPARATUS FOR FUEL INJECTION PUMP Filed June 24, 1954 3 Sheats-Sheet 1 0 I; 5' MT: r "llllllll zzllllll i Mi; i

I F I I I H INVENTORJ.

KENNETH 1..FANCHEE THOMAS TD.

Dec. 10, 1957 n l. FANCHER ETAL 2,81

TIMING APPARATUS FOR FUEL INJECTION PUMP Filed June 24, 1954 3 Sheets-Sheet 2 INVENTORS. KENNETH I 'FANCHE'E THOMAS J). HESS ATTOPA E).

Dec. 10, 1957 K. 1. FANCHER EIAL 2,815,741

TIMING APPARATUS FOR FUEL INJECTION PUMP Filed June 24, 1954 3 Sheets-Sheet 3 INVENTORS. KENNETH I. FANCHELE THOMAS :D. HEss ATE OEA/EY United States Patent TIMING APPARATUS FOR FUEL INJECTION PUMP Kenneth I. Fancher, Springfield, and Thomas D. Hess, Agawam, Mass., assignors to American Bosch Arrna Corporation, a corporation of New York Application June 24, 1954, Serial No. 439,101

6 Claims. (Cl. 123-139) This invention relates to fuel injection pumps and has particular reference to a new and improved arrangement for varying the timing of injection by the pump.

An object of the invention is to provide a new and improved variable timing mechanism for a fuel injection pump which is simple, inexpensive and positive acting, which does not require high pressure supply pumps as required by hydraulic type timing apparatus and which is easily adaptable to manual control as well as automatic control.

Another object of the invention is to provide a fuel injection pump having a new and improved injection timing arrangement which is automatic and which is pneumatically controlled.

Another object is to provide an injection timing arrangement for fuel injection pumps which timing arrangement is controlled by air velocity.

Another object is to provide an injection timing arrangement of the type set forth which is engine speed responsive.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings. It will be understood that changes may be made in the details of construction and arrangement of parts shown and described without departing from the spirit of the invention as set forth in the accompanying claims, as the preferred form has been given by way of illustration only.

Referring to the drawings:

Fig. l is a side view of a fuel injection pump embodying the invention;

Fig. 2 is a sectional view taken on line 2-2 of Fig. 1, looking in the direction of the arrows; and I Fig. 3 is a longitudinal sectional view of the fuel injection pump.

Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout, the pump shown embodying the invention comprises a housing in which is journaled a rotor having a driving portion 11, injection pump portion 12, distributing portion 13 and metering portion 14.

The rotor is provided with a duct or passage whereby the metering portion 14 communicates with the injection pump portion 12 and the distributing portion 13 also communicates with injection pump portion 12.

Surrounding the metering portion 14 are provided the outlets 16, each of which is adapted to communicate with a combustion chamber of an internal combustion engine, or the like, and each of which is adapted to communicate with the metering portion 14 through duct or passage 17 in metering portion 14 and the radial passages 18, one of which is provided for each of the outlets 16 and which are adapted to communicate with passage 17 successively upon rotation of rotor 11.

The delivery valve 19 is provided in the passage or duct 15 between the injection pump portion 12 and the distributing portion 13.

Fuel is supplied to the pump from sump 20 through ports 21 and passages 22 in rotor 11.

The inlet passages 22 and the distributing passage 17 are so related as to provide a rotor valve action whereby the filling through ports 22 will occur in the period between the aligning of port 17 with each of the radial ports 18.

injection pump portion 12 comprises a pair of opposed plungers 23 with the spring 24 therebetween for urging said plungers apart during the suction stroke and the pumping stroke is effected by the internal cam 25 having opposed lobe portions which through the rollers and tappets, urge the plungers toward each other on the pumping stroke.

The metering portion 14 is provided with the radial passages 26 for bypassing fuel from passage 15 and thereby controlling the quantity of fuel injected by the pump.

Overlying passages 26 is the control sleeve 27 which has the ports 28 through which fuel is bypassed and the relation of sleeve 27 and ports 28 to ports 26 controls the quantity of fuel bypassed.

The centrifugal governor 29 has a portion connected to the sleeve 27 and the ball weights 30 for actuating the sleeve in one direction against the force of governor spring 31 which urges the sleeve in the opposite direction through governor lever 32.

In order to vary the timing of injection by the pump, the sleeve 27 is rotated relative to rotor 11 thereby varying the relationship between ports 26 and sleeve ports 28.

In order to rotate sleeve 27 relative to rotor 11, the sleeve is connected to longitudinally movable shaft 33 by means of pin 34 which is fixed on shaft 33 and extends into an opening in sleeve 27.

Sleeve 33 is provided with a cam slot 35 in which is positioned fixed pin 36 whereby rotation or pivotal movement of shaft 33 effects longitudinal movement thereof and thereby effects pivotal movement of sleeve 27 relative to metering portion 14 of rotor 11.

Shaft 33 is connected by link 37 which is eccentrically mounted on shaft 33 by means of member 38 which has at its opposite end a pointer 39 adapted to cooperatively function with scale 40 for indicating the condition of the sleeve on the rotor and thereby indicating the timing of injection for which the pump is adjusted.

On link 37 is mounted the stop 41 adapted to engage the adjustable stop screw 42 for limiting the amount or range of timing for which the pump can be adjusted. We have found that the usual desired range is 12 but the range can be varied by adjusting the stop screw 42.

Link 37 is connected at its free end to link 42a which is connected to diaphragm 43 which is positioned in diaphragm housing 43a and which is adapted to be moved against a force of spring 43b by suction through tubing 43c effected by the velocity of air passing through ventura tube 44 in engine manifold 45.

It will be seen that as the velocity of air passing through the ventura tube 45 is engine speed responsive, that the timing arrangement actuated thereby, is also engine speed responsive and that the timing apparatus will function automatically according to change in engine speed to vary the timing of injection by the pump in accordance therewith.

In operation, as the velocity of air in the manifold varies in accordance with variations in the speed of the engine, the velocity of air passing through ventura tube 44 will also vary accordingly, thus varying the suction in diaphragm housing 43a, whereupon, link 37 will be adjusted either by the force of spring 43b or the suction overcoming the force of such spring and adjustment of link 37 will cause pivotal movement of shaft 33 relative to fixed pin 36 and through pin 34 will effect pivotal adjustment of sleeve 27 relative to rotor 14 to thereby vary the timing of injection by the pump relative to the engine speed.

From the foregoing it will be seen that we have provided new and improved means for accomplishing all of the objects and advantages of the invention.

We claim:

1. In a device of the character described, a fuel injection pump comprising a rotor having a fuel passage therein and a port communicating with said passage, a sleeve surrounding said rotor, said sleeve being adjustable along said rotor relative to said port and said sleeve being pivotable relative to said port on said rotor and means for effecting pivotal movement of said sleeve on said rotor, said means comprising a movable shaft operatively connected to said sleeve and a pressure actuated diaphragm operatively connected to said shaft effecting movement thereof, said diaphragm being connected to the engine manifold by an air passage and adapted to be actuated by air velocity therein and manifold pressure amplifying means in the manifold for increasing the velocity of the air and the resultant force on the diaphragm.

2. In a device of the character described, a fuel injection pump comprising a rotor having a fuel passage therein and a port communicating with said passage, a sleeve surrounding said rotor, said sleeve being adjustable on said rotor relative to said port for controlling the timing of injection by the pump and means for effecting adjustment of said sleeve on said rotor relative to said port, said means comprising a movable shaft operatively connected to said sleeve and a pressure actuated diaphragm operatively connected to said shaft for effecting movement thereof, said diaphragm being connected to the engine manifold by an air passage and adapted to be actuated by air velocity therein and manifold pressure amplifying means in the manifold for increasing the velocity of the air and the resultant force on the diaphragm.

3. In a device of the character described, a fuel injection pump comprising a rotor having a fuel passage therein and a port communicating with said passage, a sleeve surrounding said rotor, said sleeve being adjustable along said rotor relative to said port and said sleeve being pivotal relative to said rotor and means for effecting movement of said sleeve on said rotor, said means comprising a movable shaft connected to said sleeve and a pressure actuated diaphragm operatively connected to said shaft and for effecting movement thereof, said shaft being longitudinally movable and having a cam slot and a fixed pin in said slot for effecting longitudinal movement of said shaft upon pivotal movement thereof, said diaphragm being connected to the engine manifold by an air passage and adapted to be actuated by air velocity therein and manifold pressure amplifying means in the manifold for increasing the velocity of the air and the resultant force on the diaphragm.

4. In a device of the character described, a fuel injection pump comprising a rotor having a fuel passage therein and a port communicating with said passage, a sleeve surrounding said rotor, said sleeve being adjustable along said rotor relative to said port for controlling the quantity of fuel delivered by the pump and said sleeve being pivotable relative to said rotor for controlling the timing of injection by the pump and means for effecting pivotable movement of said sleeve on said rotor, said means comprising a movable shaft connected to said sleeve and a pressure actuated diaphragm operatively connected to said shaft and for effecting movement thereof and stop means for limiting the amount of movement of said link, said diaphragm being connected to the engine manifold by an air passage and adapted to be actuated by air velocity therein and manifold pressure amplifying means in the manifold for increasing the velocity of the air and the resultant force on the diaphragm.

5. In a device of the character described, a fuel injection pump comprising a rotor having a fuel passage therein and a port communicating with said passage, a sleeve surrounding said rotor, said sleeve being adjustable along said rotor relative to said port for controlling the passage of fuel through said port and thereby control the quantity of fuel delivered by the pump and said sleeve being pivotable relative to said port on said rotor for controlling the timing of injection by the pump and means for effecting pivotal movement of said sleeve on said rotor, said means comprising a movable shaft operatively connected I to said sleeve and a ressure actuated diaphragm operatively connected to said shaft and for effecting movement thereof, said diaphragm being connected to the engine manifold and adapted to be actuated by manifold pressure and stop means for limiting the amount of movement of said shaft, and manifold pressure amplifying means in the manifold for increasing the velocity of the air and the resultant force on the diaphragm.

6. In a device of the character described, a fuel injection pump comprising a rotor having a fuel passage therein and a port communicating with said passage, a sleeve surrounding said rotor, said sleeve being adjustable along said rotor relative to said port for controlling the passage of fuel through said port and thereby control the quantity of fuel delivered by the pump and said sleeve being pivotable relative to said port on said rotor for controlling the timing of injection by the pump and means for effecting pivotal movement of said sleeve on said rotor, said means comprising a movable shaft operatively connected to said sleeve and a pressure actuated diaphragm operatively connected to said shaft and for effecting movement thereof, said shaft being longitudinally movable and having a cam slot and a fixed pin in said slot for effecting longitudinal movement of said shaft upon pivotal movement thereof and stop means for limiting the amount of movement of said shaft, said diaphragm being connected to the engine manifold by an air passage and adapted to be actuated by air velocity therein and manifold pressure amplifying means in the manifold for increasing the velocity of the air and the resultant force on the diaphragm.

References Cited in the file of this patent UNITED STATES PATENTS 2,063,848 Meyer et a1. Dec. 8, 1936 2,624,327 Hogeman Jan. 6, 1953 2,683,445 Seaver July 13, 1954 FOREIGN PATENTS 825,628 France Mar. 9, 1938 

